Ore-stamp



UNITED STATES PATENT OFFICE;

DAVID M. SMYTH, or PASADENA, CALIFORNIA.

ORE-STAM P.

SPECIFICATION forming part of Letters Batent No. 605,615, dated June 14, 1898. Application filed June 9, 1897. Serial No. 639,935. (No model.)

To all whom it may concern.-

Be it known that I, DAVIDM. SMYTHfa citizen of the United States, residing at Pasadena, in the county of Los Angeles and State of California, have invented an Improvement in Ore- Stamps, of which'the following is a specifics tion.

In mining machinery vertical-acting stamps have been made use of for pulverizing aurif erous materials both dry and in connection with a supply of water. There is, however, considerable friction in the mechanism that gives motion to the stamps, and the blow of the stamp is often sluggish and not well adapt ed to finely pulverize the ore. I am aware that drilling and other'tools have been actuated by the reciprocating cores of electric solenoids; but these have not been well adapted to use. in a stamp-mill Where there are several stamps in operation at the same time.

In the present improvements the stamps 1 are actuated by electromagnetism, and two stamps are so connected that one stamp is raised as the other one is projected downward, thereby causing the stamps to work in unison and lessening the electromotive force necessarily provided in actuating such stamps.

The drawing is a diagrammatic elevation vertically, and a suitable frame 0, with cross bars E, is provided for supporting the helices F G H I, through which the stamps A B are free to reciprocate, and to the binding-posts K L conductors are led from a battery or other source of electric energy, and there is a switch N,-having arms 2and 3, acted upon by. the

stamps and serving to move the switch to the A contact 5 and then to' the contact 4, and the circuit connections are arranged substantially as indicated-that is to say, the returnwires 9 6 7, 8 from the respective helices lead to the binding-post K and the negative electrode, and the wire 10 leads from the positive electrode to the switch N, and the contact 5 of the switch is connected by the wire 11 to the magnet H and by the wire 12 to the magnet F, andvthe contact 4 is connected by the wire 13 to the magnet I and by the wire 14 to the magnet G.

,VVhen a current is supplied to the apparapost K. Hence as the stamp B is raised the stamp A is forcibly drawn down by the action of the electromagnet F, the magnet G at this time being out of circuit. Thereby a forcible blow is struck upon the materials intervening between the stamp A and the bed D.

"As the switch N is changed from 5 to at by the upward movement of the stamp B the circuit connections are reversed and the magnet G energized through 4, l4, and 6, so as to lift the stamp A, the magnet F being out of circuit, and at the same time the magnet I is energized through 4:, 13, and 8, so as to pull :d ownthe stamp B with considerable rapidity 311d force for pulverizing the materials between such stamp 13 and the bed D. By this arrangement the two stamps are made to work in unison and the upward movement of one changes the circuit connections to itself and to the other, so that one stamp is drawn up while the other one is accelerated in its downward movement by the action of the magnetismi t It will be apparent that one switch may be made to Work with any desired number of stamps, the circuit connections being simply duplicated, and one set of stamps will be elevated simultaneously whilethe other set of stamps falls, and their movements are accelerated by the magnetic action;

It is advantageous to arrange the parts in such a manner that the rodof the stamp will project above the top of the upper helix less than the lower end of such rod is below such helix in order that the electromagnet may have sufficient force for raising the stamp and of circuit connections and a switch that is changed by the upward movements of the stamps alternately, forenergizing the mag nets and raising one stamp and accelerating I 5 the fall of the other, substantially as specified. Signed by me this 1st day of June, 1897.

DAVID M. SMYII.

Vitnesses:

JOHN ISIcDONALD, ANN E. DEAN. 

